Send title, image, and alt text separately for Campfire compat

Hi!

I noticed that the output did not print the image properly in chat when using the Campfire adapter, so I changed it from sending a single string, to sending a separate message for each.

I’m afraid I have not tried any other non-shell adapter, so I have no idea how this behaves for people not using Campfire or Shell.

// @Burgestrand